Hmmm... My first instinct is to say no, that the cable did not veil the music at all, but given that we all hear similar, yet differently, I agree with your description of vinyl-like qualities, though I wonder if that might be the trade off. I, too, am strictly headphones, but I use HD800s, which are very microscopic, but also a smidge bright with the DAVE on some music, so perhaps my detection of details comes from cans, whereas, I don't know, I've yet to try the FUs (coming to me soon), buy because I haven't heard the FUs I wonder if they are quite as detailed as the Senns.
I'll tell you what, I'll give the FU/DAVE combo a good listen and report back. What are you using to power your mRendu? I got my LPS-1 to power it and my Curious link at about the same time, so I was always using them in tandem. I had let my link burn in for close to 200hrs and at first the cable sounded rather generic, but in the end I felt that it imparted about a 1% difference in quality on the plus side. Out of all the USB cables I had tested, it might come as a shock that it boiled down between the stock cable that came with the DAVE and the Curious link. I thought that the half-dozen others that I had tried colored the sound too much, or hardened the sound. I found it strange that the stock cable sounded good right out of the box, and it stayed that way, as if no burn in was required.
So yeah, I'll let you know, as I A/B the different cables with the FUs and the Senns.
